Suggest Remedy For Small Hard Cyst In The Groin Area

Hi,
Male.age 64..had radical cancerous prostate removal 18 months ago. All PSA's since then are at virtual zero.
I noticed, quite by accident last evening that I had developed a small hard cyst in the groin area (shaven) at the very top of the groin between the right side of my scrotum (not on the scrotum) and where the thigh adjoins. I have never had this condition before.
Since I previously (long ago) had similar type cysts iunder the armpits and on my face, I squeezed it with the intention of releived the built up pressure and also to release any fluid that might have built up. Initially, some sebaceaous type (zit - like) thick white creamy substance and also some very thin clear fluid emitted..this was followed by some light and thin blood (assume coupled with the clear fluid). After that, it was extremely painful and I can feel a hard cyst-like nodulewashed the area and covered it overnight with a bandaid with icthammol in hopes of inducing any other 'junk' to the surface. The hard cyst remains and it doesn't appear as if there is any more near-surface fliud to remove easily.
What might this suggest and what do you recommend?
Thank you.